Punching machine



L. STREIBEL.

PUNCHING MACHINE.

APPLICATION FILED JAN. as, 1922.

Patented May 30, 1922.

INVENTOR: pm gw/ UNITED STATES PATENT OFFICE.

fi REIBEL, OF KARLSRUI-IE, GERMANY, ASSIGNOR OF TWO-THIRDS TO ADAMEI-IRESMANN AND OSCAR HATER, BOTH OF KARLSRUHE, GERMANY.

PUNGI-IING- MACHINE.

Application filed. January 18, 1922.

T 0 all whom it may concern:

Be it known that I, Ltinwre S'rRnrenL, a German citizen, residing atKarlsruhe, Germany, have invented certain new and useful Improvements inPunchmg Machines for which I have filed an application in (Jermany,January 8, 1921), of which the following is a specification.

This invention relates to machines for punching holes in leather, paper,and the like, particularly for making the usual ornamental perforationsin the edge of the uppers of boots and shoes. The invention relatesespecially to the device driving the punchor die-holder. This deviceconsists as usual of a cam-disk mounted on the driving shaft, towardwhich cam-disk the punchholder is pressed by means of a helical springmounted on the holder, and which cam-disk on rotation of the shaftpresses down the holder against the action of said spring.

According to the invention that part of the cam-disk which causes thisdownward movement of the punch-holder, i. e. the proper cam, is radiallyadjustable in the circular disk by means of an adjusting screw, so thatthe stroke of the punch may be easily and readily regulated with thegreatest fineness and exactness.

A construction embodying the invention is illustrated by way of examplein the accompanying drawing in which Fig. l is a side view of the frontpart of a machine for making ornamental perforations in the edge of theuppers of boots and shoes, and Fig. 2 is a front view thereof.

The punch-holder a is vertically movable in the part b of themachine-frame and in the sleeve 0 supported by this part and has aforked head cZ. Between this head and the part Z) and on the sleeve 0 ismounted a helical spring 6 which has the tendency to press thepunch-holder a upwards, so that with a roller 7 mounted in the head (Zthe holder bears against the periphery of the cam-disk mounted on thefront end of the driving shaft 9. This cam-disk consists of a circularpart, i. e. the proper disk it, and of an approximately rectangularpart, i. e. the proper calm i, the latter being radially adjustable in asuitable groove pro- Specification of Letters Patent.

Patented May 30, 1922.

Serial No. 530,154.

vided in the front face of the disk 70, so

that the curved outer end of the cam projects more or less over theperiphery of the disk. On rotation of the shaft 9 with the disk It andthe cam a the latter strikes the roller f and presses down thepunch-holder a against the action of the spring 6. t For adjusting thecam i a headless forcmg screw is is provided which fits into ascrew-threaded bore in the back of the disk It opposite the cam andpresses upon the inner end of the latter; and for fixing the cam '11 in1ts position a set screw Z is provided which passing freely through aslot in the cam z and fitting into a screw-threaded bore in the disk Itpresses upon the front face of the cam. The screw Z having beenloosened, the screw 72 may be turned inwards thereby pushing the cam zoutwards and thus increasing the projection of the outer end of this camover the periphery of the disk h as well as the stroke imparted by thecam i to the punch-holder a. Or, the screw is havingbeen turnedoutwards, the cams may be pushed inwards by hand thus decreasing saidprojection as well as said stroke. In this manner the stroke of thepunch-holder a may be easily and readily adjusted with the greatestfineness and exactness.

What I claim as my invention and desire to secure by Letters Patentis 1. In a punching machine in combination, a machine frame, apunch-holder vertically movablein said machine frame, a driving shaftrotatably mounted in said machine frame, a circular disk mounted on saidshaft, a spring pressing said punch-holder upwards against the peripheryof said disk, a cam being radially adjustable in said disk so as to preject more or less over the periphery thereof, which cam on the rotationof said shaft presses down said punch-holder against the action of saidspring, and means for adj usting said cam and for fixing the same in itsposition.

2. In a punching machine in combination, a machine frame, apunch-holdervertically movable in said machine frame, a driving shaftrotatably mounted in said machine frame, a circular disk mounted on saidshaft, a spring pressing said punch-holder upwards against the peripheryof said disk, a cam nner nd f said earn, and a set screw fi tbeingradially adjustable in said disk s0 pg I Hgh 2y S1 1 1n Sald 0am lntoSald as to project more or less over the periphery S d P S g 19011 thefront, face 0f 10 thereof, which cam on the rotation of said Sald -Q 5shaft presses down said punch-holder against 111 testlmony whereof IaffiX my slg atllrethe action of said spring, a forcingscrew sitting insaid disk and pressing upon the STREI BEL.

